Combined door-lock and burglar-alarm.



4 T.' W. SMITH. COMBINED DOORLOGK AND BURGLAR ALARM.

arrnzonlon FILED an 11, 1908.

Patented Feb. 2, 1909.

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UNITED STATES PATENT OFFICE.

THOMAS W. SMITH, OF DELPHOS, OHIO, ASSIGNOR OF ONE-HALF TO HARVEY 0. SMITH, OF MIDDLE POINT, OHIO.

' COMBINED DOOR-LOCK AND BURGLAR-ALARM.

Specification of Letters Patent.

Patented Feb. 2, 1909.

ments in combined door locks and burglar alarms, and its object is to provide a means which may be readily fitted or removed from a door without the necessity of employing tools and which will not only prevent the opening of the door when once applied, but should the attempt be made to open the door, it will cause the production of an alarm and so notify the occupant of the room that an.

attempt is being made to open the door.

The invention comprises a clamp member adapted to be secured to the trim molding alongside of the door jamb, and on thisclamp is carried a member capable of a limited longitudinal movement when engaged by the door, but then preventing further movement of the door toward the open position. This member forpreventing the opening ofthe door is in the nature of a trigger arranged to engage a spring moved plunger holding the.

spring under compression to a position where the plunger will be free to move under the ac-1 tion of the spring and ultimately come in contact with a cartridge or other means of producing an alarm, an alarm of the explosive type being preferred.

The invention will be best understood from a consideration of the following ,detaile'd description taken in connection with the accompanying drawings forming part of this speclfication, in which drawings,

Figure 1 is a horizontal central section through the device forming the subject matter of the present invention showing it applied to the trim of a door,lwhichvtrim and ,door are also shownin section. Fig. 2 is a plan view of this device with parts broken away. Fig. 3 is a perspective view of a detail of the structure.

Referring to the drawings, there are shown two plates 1 and 2 connected by hollow tubes or rods 3. The tubes 3 are firmly united at the ends to the plates 1 and 2, as by reducing the ends of the tubes and passing them through the plates and then upsetting the outer extremities of the reduced ends as indicated at 4. The tubes 3 are 'spaced apart and receive at one end rods 5 rigidly connected to another plate 6. The rods 5 serve as guides for and support the plate 6.

The plate 2 is of less width than the plates 1 and 6 which latter are of about the same size and in the same lane as the rods 5 and tubes 3. The plate 2 as a threaded opening for the reception of the threaded stem 7 of a thumb nut 8, by means of which the rod 7 is rotated. Thethumb nut is on the outer side of the plate 6 and interior thereto the stem 7 receives the nut 9, or may be appro riately shouldered to confine the said end of t e stem 7 to the late 6 while at the same time permitting t e rotative movement of the stem 7.

The plates 1 and 6 extend for a distance to one side of the plane of the stem 7 and rods 5 and are there provided with spurs 10, proj ecting from the inner faces of the said plates 1 and 6. The plates 1 and 6 may be adjusted apart or toward each other by means of the screw stem 7, and when these plates are ap plied to opposite sides of a molding strip 11 such as is usually used alongside of a door jamb, the two plates 1 and 6 may be caused to approach each other by the suitable manipulation of the stem 7 under the action of the thumb screw 8, so that the spurs 10 will enter the molding. By this means the device may be readily attached to the trim molding of the door casing, and be as readily removed therefrom, and the extent of travel of the plate 7 6 to or from the plate 2 is sufficient to provide for theapplication of the device to trim moldings of various Widths.

Extending between the plates 1 and 2 and secured at each end to these respective plates, is another tube 12. The end of this tube which passes through and is secured to the plate'2 is thickened as indicated at 13 and the interior diameter of this portion 13 of the tube is such as to readily receive and hold an ordinary blank or ball cartridgesuch as indicated at 14. The tube 12 is continuous except adjacent to the end 13 where one side is cut away as indicated at 15 for the readyinsertion of the cartridge into the bore of the stem 18. is provided with a manipulating head 19. The stem 18 through the greater portion of its length is of a diameter less than the opening 20 through that end of the tube 12 coincident with the plate 1, and the remainder of the stem 18 toward the head 19 is of greater diameter so that at the junction point of these two portions of the stem there is formed a shoulder 21. The construction is such that when the stem 18 is moved upward through the end of the tube 12 coincident with the plate 1 until the shoulder 21 is beyond the said end of the tube, the stem may be moved out of axial alinement with the tube until the shoulder 21 will engage one end of the tube and so be locked against returnmovement into the tube.

Within the tube 12 and surrounding the stem 18 is a helical spring 22 abutting at one end against the end of the tube 12 adjacent to the plate 1 and at the other end engaging a circumferential flange 23 on the corresponding end of the plunger 16 where it joins the stem 18. The tendency of the spring 22 is to force the plunger 16 toward the cartridge 14, and the position of the parts is such that when the shoulder 21 is locked behind the corresponding end of the tube 12, the spring 22 is under considerable compression. Now if the stem 18 be moved into the axial position with relation to the tube 12, the spring 22 will project the plunger 16 with force against the end of the cartridge 14, contain.- ing the usual fulminate.

Fastened to the outer face of the plate 1 in a line radial to the axis of the tube 12, is an open ended sleeve 24, in which is contained and guided a block 25, which block because of its function may be termed a trigger block. The sleeve 24 may be secured to the plate 1 in any suitable manner and in the drawing rivets 24 are shown for this purpose. The block 25 is formed at one end with a nose 26 and in the path of this nose is the shoulder end of the stem 18. The end of the block 25 remote from the nose 26 is formed with a head or flange 27, and adjacent to the nose 26 the block carries a pin 28 projecting on each side therefrom. The coaction of the head 27 and pin 28 with the sleeve 24 provides certain limited movement of the trigger through said sleeve toward and from the shoulder end of the stem 18.

When the device is properly attached to the molding 11 the trigger 25 has its head 27 in the path of a door 28, and in close relation thereto, and the length of the trig er 25 and its extent of travel is such that s ould the attempt be made to open the door 29 the nose 26 of the trigger will be forced against the stem 18 and will move the shoulder 21 of said stem free from engagement with the end of the tube 12 before the head 27 comes in con tact with the corresponding end of the sleeve 24. The trigger hasa limited free movement sothat the door may be slightly opened without operating the plunger. This tends to impress a person endeavoring to surreptitiously open the door to believe that the latter is not fastened and therefore further open the door w ith a force to surely release the plunger and fire the cartridge, thus giving the alarm.

Suppose that the guest at a hotel or a person in any other location desires to protect the room against unwarranted intrusion or against burglars, then the clamp member of the device is applied to the door trim as shown in Fig. 1 w ith the trigger 25 in the path of the door 29. The plunger 16 is moved toward the trigger end of the device until the shoulder 21 is in position to engage over the corso responding end of the tube 12, the spring 22 being com ressed by this action, and the plunger is ocked in the withdraun position by the engagement of the shoulder 21 with the end of the tube 12.

Surrounding the tube 12 designed to receive the cartridge 14 is a spring sleeve 30 capable of being both rotated and moved longitudinally on said tube 12. This sleeve 30 is provided ith an intermediate cut-away portion 31 which may be brou ht into coincidence with the opening 15 on the side of the tube 12 adjacent to the cartridge receiving portion 13. By rotating the sleeve 30 on its longitudinal axis, the cut-away portion 31 may be brought into coincidence ith the opening 15 so that the interior of the tube 12 is exposed and a cartridge 14 may then be inserted and lodged in the cartridge receiving portion 13 with its fulminate end in the path of the tooth 17 of the plunger 16. After the cartridge has been properly inserted the sleeve 30 may be rotated until the o )ening 15 is covered or closed in. Or, instead of rotating the sleeve, the latter may have been 10:3 moved longitudinally out of coincidence ith the opening 15 so that the cartridge could be readily inserted and after the insertion of the cartridge the sleeve may be moved in a longitudinal direction toward the end 13 of the 11.0 tube 12 so as to ultimately cover the openin 15.

f the attempt be now made to open the door 29 the trigger 25 is moved longitudinally until it comes in contact with the shoulder end of the stem 18 and the latter is moved by the trigger until the shoulder 21 is free from engagement with the end of the tube 12, after which the spring 22 becomes active to propel the plunger 16 rapidly and with force against the fulminate end of the cartridge, causing the latter to explode and so give an alarm to the occupant of the room that the attempt is being made to open the door. This attempt however, can not succeed since the travel of the trig er is very limited and further movement of L 1e door is then stopped by the engagement of the head 27 with the corresponding end of the sleeve 24, and since the device is firmly clamped to the trim 11 the movement of the door toward the open position is arrested after the door has been moved but the fraction of an inch.

The device is of small size and light in weight and easily applied and removed and is especially adapted for use by traveling men who desire to securely, fasten the door and also to be apprised of :any surreptitious attempt to open the door.

W hat is claimed is 1. A combined door lock and burglar alarm, comprising a clamp having two members adapted to embrace the trim molding of a door, a tubularmember carried by the clamp and providedwith a holder for a cartridge, aspring controlled plunger in said tubular member in operative relation to the cartridge holder and having a stem projecting beyond one of the clamp members and provided with a latch to look over the end ofthe tubular member, the said tubular member extending toward the other clamping member, an open ended sleeve carried by the clamp member supporting the tubular member between the latter and the door end of the said clamp member, and a sliding block in said sleeve having means for holding it in the sleeve while permitting its limited longitudinal movement at right angles and in operative relation to the stem of the plunger and having one end in operative relation to the door when the structure is in place.

2. A combined door lock and burglar alarm comprising a clamp formed of two members adapted to embrace the trim molding of a door, a tube carried by the clamp,

said tube having one end shaped to receive andhold a cartridge, and provided'with a cut-away portion for the insertion of the cartridge, a plunger within the tube shaped to engage the cartridge, said plunger being provided with a shouldered stem projecting beyond that end of the tube remote from the cartridge carrying end with the shoulder adapted to engage over the corresponding end of the tube, a spring within the tube surrounding the shouldered stem between the plunger and the corresponding end of the tube and tending to force the plunger toward thecartridge, a sleeve mounted on the clamp perpendicular to the shouldered stem of the plunger, a trigger composed of a block in and guided by the sleeve, said trigger hav ing ahead at one end and a nose at the other end, the head of the trigger being in operative relation to the door when the clamp is applied .to the trim molding of the door, and the nose of the trigger being in operative relation to the shouldered stem, and a sleeve on the tube adapted to close the cut-away poration provided for the insertion of the cartri ge.

3. A combined door lock and burglar alarm, comprising a clamp adapted to be applied to the trim molding of a door, a sleeve or tube on the clamp having one end shaped to receive and hold a cartridge and provided with a cut-away portion for the insertion of the cartridge, a spring actuated plunger in said tube having a shouldered stem adapted to'lock over one end of said tube, a trigger on the clamp in the path of the door and movable perpendicular to the longitudinal axis of the plunger to move the latter from the locked to the unlocked position, and another sleeve on the sleeve or tube movable into and out of covering relation to the cut-away portion of the said tube.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

THOMAS W. SMITH.

Witnesses:

DANIEL E. SMITH, HARVEY 0. SMITH. 

